123271990 has 16 divisors (see below), whose sum is σ = 222182352. Its totient is φ = 49243744.

The previous prime is 123271987. The next prime is 123271991. The reversal of 123271990 is 99172321.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123271991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237 + ... + 15703.

It is an arithmetic number, because the mean of its divisors is an integer number (13886397).

Almost surely, 2^123271990 is an apocalyptic number.

123271990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123271990 is a deficient number, since it is larger than the sum of its proper divisors (98910362).

123271990 is a wasteful number, since it uses less digits than its factorization.

123271990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16271.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 123271990 is about 11102.7919912065. The cubic root of 123271990 is about 497.6852874139.

The spelling of 123271990 in words is "one hundred twenty-three million, two hundred seventy-one thousand, nine hundred ninety".